Username Enumeration via Timing Attack

{
  "id": "54453e29f36c0b4c9d10a887cfd573732a424b71991b61c0bba4428dbff5704d",
  "url": "https://osv.dev/vulnerability/CVE-2026-41161",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Username Enumeration via Timing Attack",
    "summary": "Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.2.0, the /api/auth/login endpoint contains a logic flaw that allows unauthenticated remote attackers to enumerate valid usernames by measuring the application's response time. This issue has been patched in version 2.2.0.",
    "evidence": "osv:CVE-2026-41161",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-41161",
      "aliases": [
        "CVE-2026-41161",
        "GHSA-43fj-qp3h-hrh5"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/sync-in/server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "effab16967f42e097e294d719571fe516d44562b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.2.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "effab16967f42e097e294d719571fe516d44562b"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.2.0"
                  },
                  {
                    "cpe": "cpe:2.3:a:sync-in:sync-in_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.1.0",
            "v2.0.0",
            "v1.11.0",
            "v1.10.1",
            "v1.10.0",
            "v1.9.6",
            "v1.9.5",
            "v1.9.4",
            "v1.9.3",
            "v1.9.2",
            "v1.9.1",
            "v1.9.0",
            "v1.8.1",
            "v1.8.0",
            "v1.7.0",
            "v1.6.1",
            "v1.6.0",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0",
            "v1.4.0",
            "v1.3.9",
            "v1.3.8",
            "v1.3.7",
            "v1.3.6",
            "v1.3.5",
            "v1.3.4",
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.1.1",
            "v1.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41161.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:20.601669678Z",
      "provider": "osv",
      "references": [
        "https://github.com/Sync-in/server/releases/tag/v2.2.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41161.json",
        "https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-41161"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-208"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41161.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-41161",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 486577,
  "published_at": "2026-05-08T13:00:54.485+00:00"
}